| Endung | Registry-Eintrag | Anwendung (Standard) |
| .qdat | QuickTimeInstallCache | Apple Quicktime |
| .QDB | QDBdatei | |
| .QDF | QDFdatei | |
| .qds | SavedDsQuery | |
| .QDT | QDTdatei | |
| .qfx | Backup_Data | |
| .qpx | QuickTimePlayerExtension | Apple Quicktime |
| .qt | QuickTime.qt | Apple Quicktime |
| .qti | QuickTime.qti | Apple Quicktime |
| .qtif | QuickTime.qtif | Apple Quicktime |
| .qtl | QuickTime.qtl | Apple Quicktime |
| .qtp | QuickTimePreferences | Apple Quicktime |
| .qts | QuickTimeSystem | Apple Quicktime |
| .qtx | QuickTimeExtension | Apple Quicktime |
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